[blue68f100]

The 410 are the newest model with SATA Drives, hot swapable. I believe these are AMD chips

The 4200 is a older model with IDE drives. also hot swapable. Intel.

You should beable to upgade the 410 to higher cap servers drives. 250gig is the largest IDE Server drives I could find. SATA are up to 500+gig.

Adaptec has anounced that they were going to start building hardware that requires you to buy HD's from them. For some reason they think buying HD's from other sources are not as good as the ones they sell. Soon after Adaptec bought SnapAppliance the Maxtor drives starting showing up. They think they can sell more parts, yes, but for the cost of reliability. One thing I would check and specify that they use WD SE HD. If I received a new 410 or 4200 and it came with Maxtor's I would send it back. They are just plane cheap and not reliable.

Both run the Guardian OS,
Check to see if they have dual gig ports.